i got my paint kit from wal mart
9.99 or 6.99 for a real nice set, brushes and everything
i paint my color test on a piece of clear so i can hold it next to/on top of, the color im trying to match to
on the one hand some might see the playfield as being ruined
and who cares if the colors dont match perfect
just play the game and enjoy
someday "they" might reproduce your playfield if they dont already and then you can update your pinball and sell it
on the other hand, your playfield might be hard to find and they will never reproduce it and you could quickly be an expert in color matching and no one will ever know its been touched up. could even sell the pin for a profit